<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model="allchecked" />
    </label>
    <span>
      <span>已完成{{ completeNum }}</span> / 全部{{todoList.length}}
    </span>
    <button class="btn btn-danger" @click="emit('deleteAll')">
      清除已完成任务
    </button>
  </div>
</template>

<script lang="ts">
 import { defineComponent } from 'vue'
import { todoListType } from '../../App';
  export default  defineComponent({
    name:'Footer'
  })
</script>
<script lang="ts" setup>
import { computed } from 'vue'
  const props = defineProps<{
    todoList:todoListType
  }>()
  
  const emit = defineEmits<{
   (event:'allCheck',checkType:boolean):void
   (event:'deleteAll'):void
  }>()

 //计算已完成的数量
 const completeNum = computed(()=>{
   return props.todoList.reduce((p,c)=>c.done?p+1:p,0)
 })
//计算所有是否都被选中
const allchecked = computed({
  get(){
    return completeNum.value===props.todoList.length
  },
  set(checkType){
    emit('allCheck',checkType)
  }
})
</script>

<style lang="scss" scoped>
  /*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>